docs: def importance(p_todo, p_ignore_weekend=config().ignore_weekends()):
      """
      Calculates the importance of the given task.
      Returns an importance of zero when the task has been completed.
  
      If p_ignore_weekend is True, the importance value of the due date will be
      calculated as if Friday is immediately followed by Monday. This in case of
      a todo list at the office and you don't work during the weekends (you
      don't, right?)
      """
      result = 2
  
      priority = p_todo.priority()
      result += IMPORTANCE_VALUE[priority] if priority in IMPORTANCE_VALUE else 0
  
      if p_todo.has_tag(config().tag_due()):
          days_left = p_todo.days_till_due()
  
          if days_left >= 7 and days_left < 14:
              result += 1
          elif days_left >= 2 and days_left < 7:
              result += 2
          elif days_left >= 1 and days_left < 2:
              result += 3
          elif days_left >= 0 and days_left < 1:
              result += 5
          elif days_left < 0:
              result += 6
  
      if p_ignore_weekend and is_due_next_monday(p_todo):
          result += 1
  
      if p_todo.has_tag(config().tag_star()):
          result += 1
  
      return result if not p_todo.is_completed() else 0